please help... installing autometer water temp gauge (sending unit prob.)

[yellowstang1994]

Hi guys,

I got a problem and been searching but I don't know if there is any diff. in the mechanical gauge fittings over an electrical so I will re-ask. I just got an autometer water temp gauge. The sending unit they supply with the gauge won't fit completely in their adapter. I supplied a pic to show you guys what I mean.

View attachment 469268

The outside threads on the adapter are 5/16 NC 18 which appear to be the same thread as the stock sending unit. That appears to be no problem. The inside threads are 1/8 NPT 27. I tried tapping the adapter and either my tap set really sucks or brass is a pain to tap. The problem is I think the sending unit needs to be re-threaded and I can't fit the die over the unit. Does anyone have any ideas? I don't see how the sending unit can work being stuck inside the adapter? I'm clueless.

 

[302RollinHard]

Brass is fairly easy to cross thread and gauld threads.Try backing it out and cleaning both parts up (burrs, etc)the best you can and use a touch of thread dope/anit-seize and see if it will make up nice
not too sure what else to do about the sending unit (besides get a new one), but am digging your avatar. SCHWIIINNG!!!

 

[bentley429]

Tighten it down as far as you can and leave it, i wont stick out like the stock one if thats what your getting at.

 

[86bluecobra]

yes be very careful with threading. I almost stripped my sending units threads right off. it looks right to me however. 1 thing you will maybe have troubles with is air getting trapped aroun the sensor it self so maybe fill the system up before you install it so that it gets an accurate reading.

 

[rednotch]

NPT is tppered so don't expect it to fully thread.

 

[bentley429]

NPT is tppered so don't expect it to fully thread.

Exactly, just put it in.